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Q. A 4.0 kg iron ball at 225 degrees celceious is placed in a container of liquid water at 4 degrees celcious. When the system reaches thermal equilibrium, its temperature is 45 degrees celcious. What is the mass of water in the container?

Q. A loudspeaker of mass 20 is suspended a distance of 2.00 below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of 2.90.

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